An Intercomparison of the Indoor Air Sampling Impactor and the Dichotomous Sampler for a 10-μm Cut Size

Abstract

As a consequence of the promulgation of the PM-10 (particulate matter {<=} 10 {mu}m aerodynamic diameter) standard by the US Environmental Protection Agency, there is increased use of samplers that collect particles within this range. Further, to support future human health and exposure studies on PM-10, it is necessary to develop samplers that can be used in either the indoor or outdoor environment or both. A low flow rate, sharp cut indoor air sampling impactor (IASI) has been constructed with a single impaction plate and size selectively collects PM-10 mass in indoor environments. It is presently being used in the Total Human Environmental Exposure Study (THEES). In an effort to examine the collection characteristics of the IASI, a field intercomparison study was conducted using both the dichotomous sampler and the IASI. The dichotomous sampler has been routinely used to collect PM-10 in the outdoor atmosphere in anticipation of the PM-10 standard. The results of that intercomparison are reported.